Hitachi Relion 670 Series Product Manual page 60

Phasor measurement unit RES670
Version 2.2
Table 34. Four step directional negative phase sequence overcurrent protection NS4PTOC
Function
Operate current, step 1 - 4
Reset ratio
Independent time delay at 0 to 2 x I
step 1 - 4
Minimum operate time for inverse curves,
step 1 - 4
Inverse time characteristics, see table
143, table 144 and table 145
Minimum operate current, step 1 - 4
Relay characteristic angle (RCA)
Operate current for directional release
Minimum polarizing voltage
Real part of negative sequence source
impedance used for current polarization
Imaginary part of negative sequence
source impedance used for current
polarization
Operate time, start non-directional at 0 to
2 x I
set
Reset time, start non-directional at 2 x I
to 0
Operate time, start non-directional at 0 to
10 x I
set
Reset time, start non-directional at 10 x
I to 0
set
Critical impulse time
Impulse margin time
Transient overreach
60
GUID-E83AD807-8FE0-4244-A50E-86B9AF92469E v7
Range or value
(1-2500)% of lBase
> 95% at (10-2500)% of IBase
, (0.000-60.000) s
set
(0.000 - 60.000) s
16 curve types
(1.00 - 10000.00)% of IBase
(-180 to 180) degrees
(1–100)% of IBase
(1–100)% of UBase
(0.50-1000.00) W/phase
(0.50–3000.00) W/phase
Min. = 15 ms
Max. = 30 ms
Min. = 15 ms
set
Max. = 30 ms
Min. = 5 ms
Max. = 20 ms
Min. = 20 ms
Max. = 35 ms
10 ms typically at 0 to 2 x I
15 ms typically
<10% at τ = 100 ms
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Accuracy
at I £ I
±1.0% of I
r r
±1.0% of I at I > I
r
-
±0.2% or ±35 ms whichever is greater
±0.2% or ±35 ms whichever is greater
See table 143, table 144
±1.0% of I at I ≤ I
r r
±1.0% of I at I > I
r
±2.0 degrees
For RCA ±60 degrees:
±2.5% of I at I ≤ I
r r
±2.5% of I at I > I
r
±0.5% of U
r
-
-
-
-
-
-
-
set
-
-
1MRK 511 410-BEN P
and table 145
Hitachi Energy